Single-Acting Spring Diaphragm Actuators


DSA-Series single-acting spring diaphragm actuators are designed for rugged, long-life performance. The large diaphragm area allows operation with low pneumatic pressures with an opposing spring providing either Fail-Closed (standard) or Fail-Open (optional) action. A variety of positioners and other instruments can be mounted directly to the actuator.

DSA-Series actuators are available in 4 diaphragm sizes with a variety of springs to meet the thrust requirements. Additional options such as manual handwheel overrides, adjustable travel stops, and special materials are also available. Positioners can be selected to meet various hazardous-area certification requirements.

  • Reliability – Rugged construction with minimal moving parts ensures long life with low maintenance requirements.
  • Interchangeability – Actuator yokes incorporate standard industry mounting bosses for universal interchangeability.
  • Protective Coatings – External surfaces are powder coated for maximum protection against harsh environments; special coatings (including offshore epoxy) are also available.
  • Instrument Mounting – kits are available with mounting for most commercial positioners for field standardization.
Single-Acting Spring Diaphragm Actuators
  • Action

    Linear Hydraulic, Fail Closed

  • Diaphragm Area (square inches / square centimetres)

    DSA069: 69 / 445

    DSA105: 105 / 677

    DSA156: 156 / 1006

    DSA220 & DSA2204: 220 / 1419

  • Maximum Supply Pressure

    DSA069: 70 psig (4.8 barg)

    DSA105: 65 psig (4.5 barg)

    DSA156: 55 psig (3.8 barg)

    DSA220 & DSA2204: 50 psig (3.4 barg)

  • Operating Medium

    Instrument air; sweet instrument gas also available

  • Operating Pressure

    3–15 psig (0.2–1.0 barg) or 6–30 psig (0.4–2.0 barg)

  • Operating Temperature

    Standard: -40 to 180 F (-40 to 82 C)

  • Control Signal (positioner dependent)

    3–15 psig (0.2–1.0 barg), 6–30 psig (0.4–2.0 barg), 4–20 mA, HART, Fieldbus, or Profibus

  • Hazardous Area Certification (positioner dependent)

    CSA/FM/UL: Explosion Proof or Intrinsically Safe
    ATEX: Intrinsically Safe or Flameproof


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